log10(viscosity (mPa s)) = p1
                         + p2*log10(shear rate (1/s))
                         + p3*(temperature (°C))
                         + p4*log10(shear rate (1/s))*(temperature (°C)):
p1 = 4.18882
p2 = -0.632717
p3 = -0.0205908
p4 = 0.00396732
